Learn that there is this ADC hpf in the line up while converting the analog to digital. As described in the manual this filter characteristics is as follows:
-3 dB at 4Hz with Fs=48KHz, -0.5 dB at 11.3Hz and -0.1dB at 23.5Hz.
As listed in the data manual, the hpf filter can be disabled by setting register "Analog audio path control" 's bit ADCHP to '1'.
Under HPF disabled mode, ideally it should be no filter at all but would like to know is that case being tested before? or test result shows some characrteristics with cutoff at certain low and close to zero frequency. Currently, I am wonder what will be the digital output result of converting an analog square/sine wave with 16.7Hz to 33.3Hz?
Thank you.